"And I agree that the demand exists but it can't be sustained because the Dublin airport is stealing the passengers with their expansion. They now have four airlines offering flights to Canada"
I'm sorry to break this to you, but nobody is stealing anything. BFS is quite free to expand physically in a similar fashion as Dublin has- nothing stopping it!
Here's the truth - the airlines want to fly to Dublin, because demand there is infinitely higher. It really is that simple. Sure, I believe BFS can easily support a Canada service, yet the owners of BFS seem incapable of attracting anything more substantial than the odd additional EZY frequency.
The airlines ultimately choose where they fly - so accusing airports of somehow physically ransacking passengers just sounds like throwing toys from a pram.